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Problem
Problem
Find the angle between two vectors
A
=
2
i
^
+
j
^
−
k
^
\mathbf{A} = 2\hat{i} + \hat{j} - \hat{k}
A
=
2
i
^
+
j
^
−
k
^
and
B
=
i
^
−
k
^
\mathbf{B} = \hat{i} - \hat{k}
B
=
i
^
−
k
^
.
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